Thanks but I don't think the interface device name or IP matters here. Actually I'm using the workaround to use Perl sockets to listen to the mcast from the NICs then create additional threads to monitor the traffic with tcpdump. It looks clumsy but it works. However, I still have no clue why recv() of a socket mapped to a particular NIC can receives data from ALL NICs listening to the same mcast address:port.
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